import {
  document,
	window,
	HTMLCanvasElement,
	requestAnimationFrame,
	cancelAnimationFrame,
core,
	Event,
  Event0
} from "dhtml-weixin"
import * as THREE from './three/Three';

import { FlyControls } from 'three/addons/controls/FlyControls.js';

var requestId
Page({
  onShareAppMessage(){
    return getApp().onShare()
  },
  onShareTimeline(){
     return {title:"ThreeX 2.0"}
  },
	onUnload() {
		cancelAnimationFrame(requestId, this.canvas)
		this.worker && this.worker.terminate()
if(this.canvas) this.canvas = null
		setTimeout(() => {
			if (this.renderer instanceof THREE.WebGLRenderer) {
				this.renderer.dispose()
				this.renderer.forceContextLoss()
				this.renderer.context = null
				this.renderer.domElement = null
				this.renderer = null
			}
		}, 0)
	},
  webgl_touch(e){
		const web_e = (window.platform=="devtools"?Event:Event0).fix(e)
		this.canvas.dispatchEvent(web_e)
  },
  onLoad() {
		document.createElementAsync("canvas", "webgl2").then(canvas => {
      this.canvas = canvas
      this.body_load(canvas).then()
    })
  },
  async body_load(canvas3d) {
    let container;

    let camera, scene, renderer, controls;

    const clock = new THREE.Clock();

    init();
    animate();

    function init() {

      container = document.createElement( 'div' );
      document.body.appendChild( container );

      camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 15000 );
      camera.position.z = 1000;

      scene = new THREE.Scene();
      scene.fog = new THREE.Fog( 0x000000, 1, 15000 );

      const pointLight = new THREE.PointLight( 0xff2200, 3, 0, 0 );
      pointLight.position.set( 0, 0, 0 );
      scene.add( pointLight );

      const dirLight = new THREE.DirectionalLight( 0xffffff, 3 );
      dirLight.position.set( 0, 0, 1 ).normalize();
      scene.add( dirLight );

      const geometry = [

        [ new THREE.IcosahedronGeometry( 100, 16 ), 50 ],
        [ new THREE.IcosahedronGeometry( 100, 8 ), 300 ],
        [ new THREE.IcosahedronGeometry( 100, 4 ), 1000 ],
        [ new THREE.IcosahedronGeometry( 100, 2 ), 2000 ],
        [ new THREE.IcosahedronGeometry( 100, 1 ), 8000 ]

      ];

      const material = new THREE.MeshLambertMaterial( { color: 0xffffff, wireframe: true } );

      for ( let j = 0; j < 1000; j ++ ) {

        const lod = new THREE.LOD();

        for ( let i = 0; i < geometry.length; i ++ ) {

          const mesh = new THREE.Mesh( geometry[ i ][ 0 ], material );
          mesh.scale.set( 1.5, 1.5, 1.5 );
          mesh.updateMatrix();
          mesh.matrixAutoUpdate = false;
          lod.addLevel( mesh, geometry[ i ][ 1 ] );

        }

        lod.position.x = 10000 * ( 0.5 - Math.random() );
        lod.position.y = 7500 * ( 0.5 - Math.random() );
        lod.position.z = 10000 * ( 0.5 - Math.random() );
        lod.updateMatrix();
        lod.matrixAutoUpdate = false;
        scene.add( lod );

      }


      renderer = new THREE.WebGLRenderer( { antialias: true } );
      renderer.setPixelRatio( window.devicePixelRatio );
      renderer.setSize( window.innerWidth, window.innerHeight );
      container.appendChild( renderer.domElement );

      //

      controls = new FlyControls( camera, renderer.domElement );
      controls.movementSpeed = 1000;
      controls.rollSpeed = Math.PI / 10;

      //

      window.addEventListener( 'resize', onWindowResize );

    }

    function onWindowResize() {

      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();

      renderer.setSize( window.innerWidth, window.innerHeight );

    }

    function animate() {

      requestId = requestAnimationFrame( animate );
      render();

    }

    function render() {

      controls.update( clock.getDelta() );

      renderer.render( scene, camera );

    }

  }
})